archive-edu.com » EDU » W » WISC.EDU

Total: 1342

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • 24 July 1997 -- Remnants of Hurricane Danny Spawns Tornadic Thunderstorms over Virginia
    across the region The GOES 8 imagery and animations above show a curved convective band that developed over extreme northeastern North Carolina into extreme southeastern Virginia just to the northeast of the circulation center There were several reports of weak tornadoes and waterspouts around the Norfolk Virginia Beach metropolitan area between 17 25 and 19 40 UT two of these tornadoes were confirmed by the Wakefield VA NWS Office Several

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/970724.html (2012-11-14)
    Open archived version from archive


  • 15-16 July 1997 -- Extensive haze along U.S. east coast
    and drifted slowly eastward out over the Atlantic Note how a bubble of haze free air surrounds Tropical Storm Claudette on 15 July while northern portions of the haze plume become entrained into the circulation of Claudette on 16 July This haze pall formed as anthropogenic pollutants became trapped within the lowest few kilometers of the troposphere by synoptic scale subsidence associated with a persistent anticyclone over the southern U

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/970716.html (2012-11-14)
    Open archived version from archive

  • 10 July 1997 -- Severe Turbulence Injures Passengers and Forces Jet to Make an Unscheduled Landing
    35 miles southeast of Dickinson ND airport identifier DIK around 21 52 UT at an altitude of 37 000 feet Atmospheric turbulence at typical jetliner cruising altitudes can result from convective activity or from a variety of non convective phenomena jet stream circulations deformations zones orographic waves gravity waves Kelvin Helmholtz instability The GOES 8 infrared imagery above reveals that a cluster of thunderstorms was rapidly developing across southwestern North Dakota around the time of the incident The image 1 hour prior to the event left shows disorganized convection building over far eastern Montana and the Black Hills region of Wyoming and South Dakota while the image 2 hours after the event right shows a well developed convective cluster with cloud top temperatures colder than 60 C over the Dickinson ND region see magnified IR image The rawinsonde report from Bismarck ND just east of the convection indicates that these 60 C cloud tops would have penetrated above the level of the aircraft the temperature at the 37 000 foot level was about 52 C A visible image at this time revealed cloud shadows from overshooting tops indicative of vigorous thunderstorm updrafts Turbulence due to jet stream circulations was not

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/970710.html (2012-11-14)
    Open archived version from archive

  • 08 July 1997 -- Mesoscale Convective Complex and Mesoscale Vorticity Center
    cyclonic spiral moving toward Saint Louis MO The circulation was also evident on WSR 88D radar composites as it deformed the precipitation into a hooklike pattern The GOES 8 sounder derived lifted index revealed that the atmosphere quickly destabilized LI s less than 8 C once the clouds dissipated and surface heating could take place New convection did indeed redevelop in the vicinity of the MVC after 20 00 UT over eastern Missouri named after Edward Ned Johnston a NWS meteorologist who first identified such a feature in GOES imagery A NOAA Profiler time series from Lathrop MO just northeast of Kansas City MO shows how the deep westerly flow was perturbed as the MCC and it s mid level MVC developed and moved eastward Note the northerly and northeasterly flow within the 4 8 km layer during the 09 00 to 16 00 UT time frame Another feature typically exhibited by MCC s that produce a MVC is a well defined anticyclonic outflow aloft near the storm top altitude This outflow was evident from the filaments of cirrus streaming out of the southern and southeastern edges of the cirrus canopy It is interesting to note that this mesoscale vortex could be identified for the following two days as it propagated across Kentucky Tennessee and the southern Appalachians eventually exiting the South Carolina coast late in the day on 10 July GOES 9 imagery of this MVC can be found at the CIRA Daily Satellite Discussion page Additional information on this case can be found at the Springfield MO National Weather Service Forecast Office GOES 8 sounder and rawinsonde Lifted Index LI 6 panel GOES 8 sounder LI and SPC watch boxes The western portion of the outflow boundary from this MCC remained semi stationary over Kansas this surface feature

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/970708.html (2012-11-14)
    Open archived version from archive

  • 01 July 1997 -- Exhaust plume from launch of Space Shuttle Columbia (STS-94)
    becomes very diffuse and is difficult to distinguish in the later frames especially with respect to neighboring clouds Perhaps the compact circular cloud is primarily from exhaust gases near the surface associated with ignition at the ground Sea breezes from ocean to land at mid day may be moving that cloud inland toward the southwest The general surface flow however is from the northwest as is evident from the small

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/shuttle.html (2012-11-14)
    Open archived version from archive

  • 2 July 1997 -- Sounder products depicting dry slot wrapping around low pressure system
    Dry air PW less than 20 mm can clearly be seen wrapping into the low pressure system counter clockwise over Minnesota and into Wisconsin Very high precipitable water values greater than 50 mm can be seen over Illinois and Missouri A large gradient exists in this region and is characteristic of a dryline Numerous severe storms developed in conjunction with this dry air intrusion over the Midwest The image and animations on the right show the lifted index derived product from the GOES 8 sounder The lifted index is a stability parameter used to forecast the likelihood of thunderstorms and severe weather Very stable air can be seen wrapping around the low as indicated by the positive lifted index values Favorable conditions for convection are located in eastern Iowa Illinois and Missouri as indicated by the large area of negative lifted indices reds and yellows A longer sequence of lifted index images every 2 hours spanning 3 days is also available as an FLI animation 5MB file A time series of GOES 8 sounder retrievals over Omaha NE shows how the troposphere becomes progressively drier as the dry slot moves across that region Sounder values can be checked for accuracy

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/dryint.html (2012-11-14)
    Open archived version from archive

  • 01 July 1997 -- Ash plume from Popocatepetl volcano in Mexico
    and the aviation community was immediately alerted to the potential danger of a volcanic ash plume cloud However numerous thunderstorms were active across the region at the time left making the detection of an ash plume on satellite imagery somewhat difficult The split window differencing technique right is often an effective method used to detect volcanic ash plumes Since the emissivity of silicate particles in the ash cloud varies with wavelength the brightness temperatures detected using GOES 8 infrared channels 4 10 7 micron and 5 12 micron differ by as much as 5 degrees K The ash cloud appears as a dark region greater temperature difference fanning outward to the northwest at 02 45 UT on 01 July This wide pattern of ash plume dispersion resulted from directional wind shear within the middle and upper troposphere Compare this plume shape to that which occured March 12 1996 when the winds were westerly at all levels Similar emissivity differences are also observed with overshooting tops of convective cirrus canopies due to strong temperature inversions and moisture gradients within the lower stratosphere Notice how several of the smaller rapidly developing convective cloud tops storms with vigorous updrafts and overshooting tops appear

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/970701.html (2012-11-14)
    Open archived version from archive

  • 17 June 1997 -- Low-level cyclonic vortices in the eastern North Pacific trade wind region
    upwelling convection in the vicinity of the larger vortex centers but this convection has difficulty penetrating the cap of the well defined trade wind inversion Also of interest in the image animation are what appear to be gravity waves propagating southeastward through the stratocumulus field perpendicular to the direction of vortex translation Additional images from the following day 18 June 1997 GOES 9 IR 18 June 00 00 UT GOES

    Original URL path: http://cimss.ssec.wisc.edu/goes/misc/970617.html (2012-11-14)
    Open archived version from archive



  •